深冷挤出切削制备超细晶7075铝合金的组织、性能及时效行为研究

doi:10.11896/cldb.22070192

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Abstract Traditional severe plastic method inevitably produces large amounts of heat, which weakens the mechanical properties of materials. Cryogenic temperature extrusion machining (CT-EM), as a new ultra-fine grained materials fabrication process, can eliminate cutting heat, suppress dynamic recovery, and improve materials strength and machinability. In this study, the microstructure, phase evolution, mechanical properties and aging behavior of ultra-fine grain 7075 aluminum alloy chips fabricated by RT-EM and CT-EM were analyzed. The results show that the average grain size of CT-EM chips is highly refined, the dislocation density is higher, and the hardness and strength are further improved. After aging treatment, a large number of dispersed precipitates appeared in the chip, the yield strength of RT-EM and CT-EM chips increased to 455 MPa and 507 MPa respectively. The grain strengthening, dislocation strengthening and precipitate strengthening work together. Cryogenic temperature treatment can enhance the precipitate kinetics of secondary phase in the microstructure, so that the CT-EM chips reach peak hardness faster. Additionally, the elongation of peak aged CT-EM sample is slightly improved, and more dimples are present in the tensile fracture.

Key words： cryogenic temperature extrusion machining Al 7075 alloy ultra-fine grained mechanical property aging treatment

Published: 25 November 2023 Online: 2023-11-21

CLC number:

TG146.2+1

Fund:National Natural Science Foundation of China (52105499), Scientific and Technical Key Project in Henan Province (222102220052), Key Scientific Research Projects of Colleges and Universities in Henan Province (23A460008), and Fundamental Research Funds for Zhongyuan University of Technology (K2022YY001).

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	Articles by authors
	YIN Xiaolong
	WANG Zhilin
	WANG Wan
	YU Hechun
	WANG Hanbin
	YAN Wenjie

Cite this article:

YIN Xiaolong,WANG Zhilin,WANG Wan, et al. Research on Microstructure, Mechanical Properties and Ageing Behaviors of Ultra-fine Grained 7075 Aluminum Alloy Fabricated by Cryogenic Temperature Extrusion Machining[J]. Materials Reports, 2023, 37(22): 22070192-6.

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http://www.mater-rep.com/EN/10.11896/cldb.22070192 OR http://www.mater-rep.com/EN/Y2023/V37/I22/22070192

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